问题
选择题
----- What about going to the South Lake for a picnic next weekend?
----- OK. But I’m not sure ________ it will rain.
A．why
B．where
C．when
D．whether
答案
答案：D
根据上下文可知，第二个人同意下周末去野餐，但又不能确定是否会下雨，故选D。
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